Tool-holder.



Patented Feb. I I, [902.

A. H. &. J. A. BEDWORTH. TOOL HOLDER? (Application filed In. 28, 1901.)

(No Model.)

THE

co. PHoTuuYHo" WASHINGTDN, D c,

UNITED STATES PATENT OFFICE.

ARTHUR H. BEDWORTH AND JOHN A. BEDlVORTH, OF BOSTON, MASSACHU- SETTS, ASSIGNORS OF ONE-THIRD TO F. S. WEBSTER COMPANY, OF BOS- TON, MASSACHUSETTS; NEW YORK, N. Y.; CHICAGO, ILLINOIS, AND LON- DON, ENGLAND, A CORPORATION OF MAINE.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 693,346, dated February 11, 1902.

' Application filed March 28,1901. Serial No. 53,291. (No model.)

One of the objects of our inventi'on is to positively move "the tool-carrier toward and from the work in such a manner that the cut will always be on the center line of .the work, so that the tendency to break the tool due to catching or digging into the work is entirely;

obviated. Means are provided for adjusting the throw of the tool-carrier according to the depth of cut and the diameter of the work.

Another object of our invention is to provide a self-adjusting work-rest which automatically adapts itself to the diameter of the work, after which the work-rest is securely clamped in adjusted position.

Another object of our invention is to provide convenient means for conveying lubricant directly to the cutting portion of the tool.

Various other novel features of our invention will be hereinafter described, and particularly pointed out in the following claims.

Figure 1 is a side elevation of part of a turret-lathe with a tool-holder embodying one form of our invention mounted in the turret in operative position. Fig. 2 is an enlarged front elevation of the tool-holder shown in Fig. 1. Fig. 3 is aloft-hand side elevation thereof. Fig. 4 is a right-hand side elevation I of the tool-holder; and Fig. 5 is a sectional View thereof on the line 00 a, Fig. 2", looking toward the right.

We have herein shown the tool-holder as comprising a substantially L-shaped body portion 1 2, provided with a rearwardly-extended shankor stem 3, adapted to be fitted in one of the sockets of a turret T, Fig. 1, or in any other suitable support, the lower and forwardly-extended arm 2 of-the tool-holder having an upright longitudinal guideway 4 therein. (See Fig. 2.) We have mounted the work-rest in this guideway, and said workrest is herein shown as comprising two independent members or jaws 5 5, placed side by side and longitudinally movable in the guide- Way, the upper ends of the jaws being oppositely beveled, as at 6' 6, to receive the work. A plate 7 is secured in-the bottom of the guideway, as by screws 8, Fig. 3, said plate supporting two'spiral springs 9, one for each jaw, and interposed between the plate and the bottom of the jaw a back-stop for each jaw, shown as a long screw 10, being supported in a threaded opening in the plate 7 and extending up through the spring 9 to the under side of thejaw. When setting up the tool, the back-stops are withdrawn from the jaws 5, permitting the springs to control them, a clamp-screw 11, extended into the side of the guideway to bear against one of the jaws, being also loosened, so that the jaws can move easily in the guideway. The work is held in the chuck C, Fig. 1, and the turret is moved toward it until the end ofthe work'engages the jaws 5, and obviously they will adjust themselves thereto accurately by the action of the springs, after WhiChihG clamp-screw 11 is set up, tightly holding the jaws clamped in adjusted position, and the back-stops are screwed in until they touch the ends of the jaws and provide rigid supports therefor.

Heretofore it has been common to adjust the work-rest to the work by means of adjusting-screws, the eye of the workman and his sense of touch being depended upon to get the proper adjustment; but such method is slow and unsatisfactory and frequently a number of trials have to be made. So, too,

the work is often thrown off center very slightly, but enough to prevent great accuracy in the finished article.

With our invention the springs act to just bring the jaws against the work, there being nothing to throw the latter out of line or distort it in any way, and a few seconds suffice to get the work-rest ready and accurately adjusted for use.

The outer or front face of the upright part 1 of the body is provided with a groove or guideway 12, Figs. 3 and 4, preferably at an angle of forty-five degrees to a vertical line through the work-rest, to receive a rib 13 on the back of a guide 14, shown as an elongated block provided in its front face with an undercut groove 15.

Referring more particularly to Figs. 3 and 5, the upper end of the rib is longitudinally recessed at 16 and provided with a transverse socket 17, the latter receiving loosely a portion of a short adjusting-screw 18, having journals 19 supported in the recess 16. The bottom of the guideway 12, at its upper end, has a semicircular threaded recess 20 opposite the recess 10, and when the guide 14 is in position on the body the teeth of the screw 18 engage the threaded recess, so that rotation of the screw in one direction or the other will move the guide longitudinally up or down, the upper journal. of the screw being nicked to take the blade of a screw-driver, by which it may be rotated. A strong retaining-screw 21 is extended through an elongated slot 22 in the back of the body of the tool-holder into the guide 14 toretain the latter in place and to clamp it in position after it has been longitudinally adjusted by rotation of the screw 18, the adjustment of the guide, which supports the tool carrier,accommodating stock of different diameters, the larger the diameter of the work the more will the guide be moved upward on the tool-holder body.

The tool-carrier is shown as a block 22, having on its rear face a rib 23, whose sides are undercut or beveled to correspond to the undercut groove 15 in the guide, so that the tool-carrier will be retained upon the guide without interfering with its longitudinal movement thereupon. The rib 23 is made somewhat smaller than the guideway 15 to permit the insertion of a gib 24, held in place by screws 25, (see Fig. 3,) and serving to take up wear.

The lower end of the tool-carrieris provided with a transverse seat 26 for the tool 27, the latter being securely clamped upon the tool by a clamp-screw 29, extended into the toolcarrier, as clearly shown in Figs. 2 and 5. By slightly loosening the clamp-screw 29 the faceplate is slackened sufficiently to permit removal of the knife longitudinally from the seat for grinding or replacement, as the case may be.

\Ve have provided a back-stop for the tool, herein shown as a screw 30, mounted in the tool-carrier and with its head 31 extended across the back end of the tool.

liysettingupthe clamp-screw29 easilya very fine adjustment for the tool can thereafter be effected by rotative movement of the backstop 30. This backstop also provides a sup port for the tool in the direction of its length, so as to prevent any possible chance of longitudinal movement when making the cut.

The tool-carrier is positively moved upon the guide 14 by simple means now to. be described, said means being herein shown as a disk 32, eecentrically mounted on a shaft 33, which extends through the tool-carrier and at its outer end has secured to it an actuating arm 34, provided with a suitable handle 35. The cam-disk 32 extends into a transverselyelongated seat 36 (see dotted lines, Fig. 2) in the bottom of the guideway 15, formed in the guide 14, so that rotative movement of the shaft 33 willslide the tool-carrier positively in one direction or the other.

In Fig. 2 the tool-carrier is shown as moved away from the work; but if the actuator is swung into dotted-line position, Fig. 2, the tool-carrier will, through the cooperation of the cam 32 with the seat in the guide 14, move the tool-carrier downward to bring the tool into cutting position, and it will be obvious that the depth of the cut will depend upon the position of the actuator when thrown to the left. A fixed stud 37 limits the movement of the actuator, and consequently the retractive movement of the tool-carrier, and we have shown a simple form of adjustable stop to limit the throw of the actuator, and hence the movement of the tool-carrier, in the opposite direction. A disk 38 is eccentrically pivoted at 39 on the base of the tool-carrier, near its upper end, said disk being provided with a series of adjustable stop-screws 40, the outer ends of which are diiferent dis tances from the pivot 39 of the disk. A smaller disk 41 is secured to or forms a part of the disk 38 and is provided with notches 42, adapted to cooperate one at a time with a spring locking-finger 43, mounted on the toolcarrier. The notches 42 are so arranged that they correspond to the several screws 40. As shown the disk is set for the intermediate position between maximum and minimum cut, so that when the actuator 34 is moved into dotted-line position, Fig. 2, the cut will be neither maximum nor minimum, also that one of the screws 40,whose outer end is nearest the pivot 39, will of course permit the greatest movement of the acuator, and hence the deepest cut, while the screw farthest away from the pivot will, if turned into operative position, permit only the minimum cut to be made. The locking-finger 43 entering one or the other of the notches 42 will hold the disk 38 in position with the desired stop in the path of the actuator.

With the tool-holder herein shown the out can be started with the work of maximum diameter and the latter turned down to desired diameter without any adjustment whatever ICC or necked screws and studs of various types.

The cutting-tool is located above the work, as will be manifest, so that 'front and back tools can be brought into operative position above the tops of the jaws of the work-rest to act upon the Work without interfering with the parts of the tool-holder herein shown and described.

By turning the screw-stops 4:0 in or outin the disk the adjustment for the movement of the tool-carrier may be varied to within very.

small limits, and a very delicate adjustment is thereby effected.

We have provided means for con veying lubricant directly to the cutting portion of'the tool by making an oil-duct 4A in the tool-carrier, the delivery end 45 -of said duct being located adjacent the cutting end of the tool,

and by inserting the end of a flexible tube T, Fig. 1, in the upper or inlet end 46 of the oilduct the latter can be connectedcontinuously with a suitable reservoir, the tube conveying the lubricant to the duct, obviating IDOVG? ment of the oil-nozzle back and forth by the operator, as is now very, common practice.

With our improved tool-holder .the operations of roughing and finishing the work are performed at the same time, something which cannot be accomplished with a hollow mill, the form ottool usually employed for doing the same class of work. A

We believe that the roughing and finishing is due to the firm support of the work by the work-rest during the action of the single cutting-tool, the work being so heldthat there is no vibration or jarring thereof possible.

- Our invention is not restricted to the construction and arrangement herein shown, as the same may be modified or changed in various particulars without departing from the spirit and scope of our invention.

Having described our invention, what we claim, and desire to secure byLetters Patent, 1s-

1. In a device of the class described, a toolcarrier movable toward and from the work, a

guide upon which the tool-carrier slides, a cam rotatably mounted on one of said members and in operative engagement with a seat in the other, to positively move the tool-carrier on its guide, an actuator rigidly secured to and to rotate the cam, and means mounted on the tool-carrier and cooperating with the actuator to vary the movement of the toolcarrier toward the work.

2. In a device of the class described, a toolcarrier movable toward and from the work, a

guide upon which the tool-carrier slides, a

cam rotatably mounted on one of said members and in operative engagement with a seat in the other, to positively movethe toolcarrier on itsguide, an actuator rigidly secured to and to rotate the cam, arfixed stop to limit the movement of the actuator in one direc- I tion, and an adjustable stop to control its movement in the opposite direction, said adjustable stop being mounted on the tool-carrier.

3. Ina device of the class described, atoolcarrier movable toward and from the work, a

guide upon which the tool-carrier slides, a cam rotatably mounted on one of said members and. inoperativeengagement with a seat in theother, to positively move the tool-carrier on its guide, means to adjust the. guide in the direction of movement of the tool-car rier and. to hold it in 'adjusted position, and an-actuator rigidly secured to and torotat'e the cam and thereby move the tool-carrier on; the guide towardand'from the work.

4. In a device of the class described, a toolcarriermovable toward and from the work, a

guide npon which the tool-carrier slides, said guide having a cam-seat in its face, a cam mounted on the tool-carrier, and in operative engagement with the seat, to positively move the tool-carrier in either direction, a swinging handle secured to and to rotate the cam,

to retract the tool-carrier, aneccentricallymounted stopdisk to limit its movement in the opposite direction, and a locking device to hold saidstopdisk in adjusted position.

5. In a tool-holder of the class described, a movable tool .-;carrier,a guide on which it moves, an adj llStll'lg-SCIGW rotatablymounted on the guide and engaging a threaded seat in justed position.

7. In a tool-holder, a guide, a workrest mounted therein and including a pluralityof longitudinally and independently slidable jaws arranged side by side, spring-operated means to effect movement of the latter into adjustment relative to the work, and. means to clamp the work-rest in adjusted position in the guide.

8. In a tool-holder, a self-adjusting workrest, an adjustable back-stop for the workrest, and an independent clamping device to clamp the work-rest in adjusted position.

9. In a tool-holder, a work-rest including two independent self-adjusting jaws, an adjustable back-stop for each jaw, anda clamping device to clamp the jaws in adjusted position.

10. In a tool-holder, a guide, a work-rest comprising two jaws independently movable therein, a spring for each jaw, to. move it against the work, a back-stop adjustable be- .a fixed stop to limitmovem ent of the handle fee the tool-holder, to adjust the guide longitudihind ezteh jaw when adjusteinnd means to In testimony whereof we have signed our in clamp the jaws in the guide in adjusted ponames to this specification in the presence of sition. two subscribing witnesses.

11. In a device of the class described, a 1 w l self-adjusting Work-rest, and an overhanging s 1 guide, a tool-eamfier movable on the guide, J and means to positively move the tool-carrier Witnesses: toward and from the WOIICJGSD, and inde- JOHN C. EDWARDS, pendently of the latteiu AUGUSTA E. DEAN. 

